Vermont is about 14 times smaller than Vietnam.

Vietnam is approximately 331,210 sq km, while Vermont is approximately 23,956 sq km, making Vermont 7.23% the size of Vietnam. Meanwhile, the population of Vietnam is ~101.6 million people (101.0 million fewer people live in Vermont).
Tip: This to-scale comparison of Vietnam vs. Vermont uses the Mercator projection, which distorts the size of regions near the poles.
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